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lrn2 irrational number
The decimal number system can only accommodate rational numbers (and even then, not all of them: try 1/3 [.333... is an infinite sequence, and can hence only be described as a limit]). Because pi's an irrational number, you can only attempt a limit.
I recall the digits of pi being easy to calculate in hexdecimal, but that's unlikely what the picture intended.
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